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The mining industry wastes are the sources of environment contamination by chemical elements.Soils contamination by heavy metals causes worsening of their biogeocenotic functions,that results in forming on them ecosystems with small biomass volume,narrow biodiversity,weak stability.The area of microorganisms homoeostasis is sufficiently wide,that testifies to their high potential stability to contamination.Therefore are actual researches of microbocenosis reaction (including structural reorganization of streptomycetes association at soils contaminated by heavy metals) on technogenic loadings which will be basis of theory development of microbial associations stability.Object of researches were the microbocenosis of industrial ground of iron-stone enriching factory and ehernozem usual,polluted by heavy metals.Qualitative changes of streptomycetes association structure determined in spring,summer,autumn.Modeling of chernozem contamination conducted at bringing of CdSO4,Ni(NO3)2,CuSO4,ZnSO4,(CH3COO)2Pb·Pb(OH) in different concentrations.Composition of streptomycetes association was explored on plates containing ISP4.Conducted analysis testifies to prevailing in edatope of industrial ground in spring of St.sporoherbeus and St.aerionidulus.At summer its percent of participation increased to 31%,and at St.conganensis was multiplied contribution to association forming (22.7%).In this period in the association marked the decline of streptomycetes species amount,which results in diminishing of biodiversity indexes values.It confirmed by the decline of likeness coefficient of this association in relation to zonal soil cenosis.In autumn,cenosis structure is restored due to species variety growth,which increases likeness of streptomycetes association with chemozem.As well as in previous periods of researches in the urbanized soil most percent of participation in cenosis is marked for St.aerionidulus (21.3%) and appears new dominant St.albocrustosus (38%).Thus,there is diminishing of association biodiversity and change of dominant species in the streptomycetes cenosis in soils polluted by heavy metals.It necessary to mark that dominant streptomycetes species obtained from urbanized soils are resistant to contamination.Data are confirmed by the models experiments results,concordantly which,in chemozem polluted by heavy metals was formed the streptomycetes specific eenosis.At the beginning of stressing action in the streptomycetes association prevailed:St.canadensis,St.violaceomaculatus,St.sporoherbeus.On 10 days of experiment,frequency of St.canadensis met decreased in 6.7 times.Also,in association the percent of St.sporoherbeus participation,which prevailed in future,increased in 2.7 times.On the succession latest stages (60-120 days) St.sporostellatus,St.albocrustosus and St.conganensis increased the percent of participation in association.Increase of these streptomycetes species participation in the association realized due to the microorganisms sensitive forms of this ecological-trophic group,which have less adaptation potential to the heavy metals high concentrations.The above-mentioned supposition is confirmed by biodiversity index decline.Thus,during a succession is marked reorganization of urbanized soils streptomycetes association,owing to dominant species replacement and sensitive forms death,which cause growth of participation percent of resistant to contamination species.